At present, the global positioning system (GPS), vehicle positioning accuracy can be increased to less than 3 meters, if so, what is the theoretical basis? If not, what is the reason?
If not, it should be a signal problem in your area.
Base station positioning accuracy is much worse, but GPS satellite positioning is very accurate
We use the accuracy of less than 15 meters, the Americans themselves can be very highThe use of GPS positioning, will be affected by a variety of factors. The factors affecting the accuracy of GPS positioning with GPS satellite can be divided into the following four categories:(1) SA from the U.S. government interests, by reducing the precision of broadcast ephemeris (Technology), adding high frequency jitter in GPS reference signal (Technology) and other methods, reduce the ordinary users using GPS navigation and positioning accuracy.(2) the satellite ephemeris error in GPS positioning, calculation of satellite orbit parameters at a time the GPS satellite position required is provided by various types of [7] ephemeris, but irrespective of the type of ephemeris, the calculated satellite location will be its true position difference, this is the so-called ephemeris error.(3) the satellite clock error of satellite clock error is the error between the installation on the GPS satellite atomic clock clock with GPS standard time.(4) satellite signal transmitting antenna phase center deviation satellite signal transmitting antenna phase center deviation is the difference between the nominal phase center and the true phase center of the signal transmitting antenna on the GPS satellite.
Can, this is according to the number of vehicle GPS terminal at the same time you receive the satellite's decision, the minimum can simultaneously receives 4 satellites, because the satellite velocity and the distance between the calculate your position according to the distance, while receiving satellite positioning accuracy of the number, the more accurate. The GPS locator in general can be simultaneously received about 6, about 3 meters error is easily available, many cases can do 0 error. I hope you understand that.
